Identification of some infants at immediate risk of dying unexpectedly and justifying intensive study.

Children who die unexpectedly in infancy often have symptoms of illness before death. Survey data are used to evaluate risks associated with symptoms. There is a 1 in 50 chance of unexpected infant death occurring in the next 9 days when two or more symptoms occur in infants defined to be at high risk by a discriminant score. The score is based on data collected on all infants at birth and by health visitors at 1 month. This system would identify 50% of cot deaths and provides a basis for prospective physiological studies.